Sucker-rod coupling



LZB ,j B. D. THOMPSON SUCKER ROD COUPLING Filed May 14 1923 CJIlPatented Get. 2l, 1924.

irs srars BURGHARD D. LHoivtrso-N, or oYoLoNn, PENNSYLVANIA.

SUCKER-ROD GPLING.

Application filed May 14, 1923. Serial No. 638,782.

To all whom t may concer/n.:

Be it known that I, Boncnnnn D. Ti-roivirsoN, a citizenl of the UnitedStates, residing at Cyclone, in the county of McKean and State ofPennsylvania, have .invented certain new..an'd useful :improvements inSticken. which the following is a Rod Couplings,`of specification. i

This invention has reference to improvements in forming connectionsbetween broken sections of what is known in the art Vas suckersrodsl foroil well .pumping gear.

These rods are used in operating the pump pumping operation frequentlycauses break-a.v

age of the rods. c

VVh'en a break occurs, the several sections of rods above the pointofthe break have to be'withdrawn from the well and disconnect-- ed atthe joints as withdrawal takes place; 1

The remaining sections of rods below the point o-flbreak will have `tobe ishedout, a method well known inthe art, which isan operationuncertain of accomplishment within a reasonable time. v

The purpose of this invention is to avoid this fishing job, as .well askto avoid the raising of the lower sections of rods posi# tione'd belowthe point of break, to a point abovetlie-surface Yof the well, necessaryto replace the broken section. v

ll/Vith my novelv device, a broken section of a suckererod'may 'be'coupled within the wellf at anyfgiven point below the surface, and whenso coupled, the whole string of rods may be placed in pumping operationwithout further delay-..1` i

This invention willbe best understood from Ya consideration of thefollowing detailed description takenV in connection withV -theVaccompanying drawings, wherein:

Fig. l, isa central longitudinal section of the invention, rtogetherwitha vertical section of the Well tubing in which the inven-y tionoperates.

Fig.. 2,' is an enlargedsectionalview of the A invention `showing thethread cutting dies andthe retaining socket' therefor.

Fig. 3, is aside elevation of thethrea'dv cutting dies. ,y y f Fig. 4,'is a view in cross section ofthe parts assembled in Fig. Q-shown .onwthelines 4.-l. l A' f Referring to the numeral l, designates theY welltubing `2,'is V the valve cage, 3, is a section of the suckerrodattached to the valve. cage, -lshown v'with parts of the rod brokenaway,e, is the internally threaded half of the Vsucker-.rod joint, 5, is theshank of the diesocket adapt ed to be screw threaded into the joint l,6, is the dieretaining shell adapted to he screw drzuvings,` (Fig. l)het threaded lon the opposite end ofdie shank 5,

.7 and 7; are the die members adapted vto bev positioned within theshell' 6. f "f v.Referring more particularly to the die members 7 and 7and their retaining. m^eans. as shown in Fig. 2, theV dieso'cket shank 5is exteri'orlyv threaded at its lower end, to engage the threadedinterior ofthe lupper end' of the shell'. The lower end of the shell 6is formed with an inwardly extending cols lar 8whi'ch is formed withvits lower face beveledoutwardly, forming an apex at -9 with Vtheexterior wall 0fthe shell 6. f

The die'socket4 shank has formedvwithin its lower end, a taperingrectangular shaped recess l0, adapted to receive a correspond-Y inglyshaped projecting tang 1l, formed.. of

teg'ral with the die members Y and 7. To maintain the die members 7 and.7 in the same relative plane, there is formed-a transf verse recess'orkey seat 13 ontheinn'er face of the die member 7, and a correspondingspline lll is formed on the .inner (face of .the other die'member'?,adapted'to register with and to residewithin the recess 13. of the diemember 7. The die members 7 and 7" as shown in assembled position-in'Fig. .Q are provided with a tapering annular recess` 15, formedcentrally in its lower end and registering with the beveled faceof thecollar 8 of the shell 6. y r

Located on the walls'offthe :annular recess l5 are sections ofprojecting. V shapedcutting teeth le, arranged in spiral andadapted tocut a screw thread in` a'lmanner well known in the art. I Y

It willbe apparent to those .skilled in. the art, that as a break occursin any rod section as at 3', the rods above thepoint of break may bewithdrawn and the thread cutting device herein described shown assembledin Fig. 2 attached to the lower end of the last section of a whole rodto be withdrawn, and the rod sections reassembled and lowered to thepoint where the break occurred. Upon reaching this point the beveledface of the collar 8 on the shell 6 will engage the end 3 of the brokenrod remaining in the well. Upon such engagement the broken end 3 will beguided in to the recess l5, until engagement is had between the brokenend 8 and the thread cutting teeth 16. `When this point of engagementoccurs the rod 3 is caused to be turned by suitable means at the top ofthe well which will communicate a like movement to the thread cuttingdies 7 and 7 a continuance of the turning movement-described will causea screw thread to be formed on the end of the rod 8. When a thread hasbeen so formed by the cutting teeth, 16, the thread will register withand reside in the groove interposed between each contiguous spiral teethsectionscomprisingthe cutters 1G, and form an effective screw joint,thus again joining the two lengths of rod sections that had becomeparted by the break. With the rod sections so joined, a continuance ofthe pumping operation may be resumed and carried on as before the breakhad occurred or the whole string of` are inserted into the well at theinitial rodding. The last joint projecting out of the well, when thelower end of the string has reached its lower position, may be too longor too short to position the screw joint thereon in proper registrationwith the pump actuating means located above the mouth of the well. Thisoften occurs atwells located some distance from industrial centers atwhich a rod Vjoint of the necessary length could be manufactured. IV iththis condition at hand, the excessive length of the rod projecting abovethe pump actuating means may be cut off and with the application of myimprovement to the severed end, suitable connection can be made with thepump actuating means.

It is tobe understood that I do not limit myself to the specific form ofapparatus herein shown, as other forms may be used without departingfrom the spirit of my invention. Y

What I claim as new, and desire to secure by Letters Patent is:

l. A screw cutting device of the character described comprising' a pumprod member, a tubular socket mounted thereon, detachable cutting. diesmounted in said socket and means integral with said dies for holdingagainst movement within the socket.

2. A device of the character described comprising a rotatable shaftpositioned within a well, a'pair of detachable thread cutting diemembers mounted thereon and means for rotating the die members actuatedat a point above the well.

3. In a tool of the class described, a pair of detachable thread cuttingcompanion dies, a tubular socket enclosing said dies, and means formedintegral with said dies to maintain them against rotation within saidsocket and. against relative movement to each other.

4. In an apparatus of the character described comprising a well pumprod, a shank member attached to said pump rod, a tubular shell memberhaving one end attached to said shank, and formed with an inwardly.extending collar on the other end, thread cutting die memberspositioned between the inwardly extending collar member and the shankmember, and means for maintaining the die members in operative positionagainst relative movement to the shank member.

5. A thread cutting tool comprising a pair of companion dies, a tubularsocket enclosing said dies, with means formed integral with said dies tomaintain them against rotation within said socket and restraining meansagainst relative movement to each other.

6. In an apparatus of the character described comprising a well pumpingrod, a

shank member detachably connected to said rod, a tubular shell memberdetachably connected to said shank, thread cutting die memberspositioned in said shell member having operative connection with saidshank member.l Y Y Y 7. A ydevice of the character described comprisinga well pumping rod extending into a well, a shank member connected tosaid rod, a tubular shell member depending from said shank member,removable companion die members positioned in said shell member havingoperative connection with said shank member and means integral with thedie members to maintain them in the same horizontal plane.

8. An apparatus for forming screw threads on a pump rod within a well,comprising a rota-table shaft, a die socket located on said shaft,thread cutting dies positioned in said socket, and means for centeringthe pump rod within said socket.

9. In a tool of the character described a pair of companion threadcutting dies, a tulll) bular socket enclosing said dies formed with atapering opening below said dies, and means formed integral with saiddies to maintain them against relative movement to each other.

l0. An apparatus for forming screw threads on a pump rod within a well,comprising a jointed shaft extending into a well,

a tubular die socket located on the lower end of said shaft,threadcutting dies positioned 10 within said socket againstrelative'movement therein, andV means for centering the pump rod withinsaid socket upon engagement therewith.

In testimony whereof I aiX my signature.

BURCHARD D. THOMPSON.

